diff options
Diffstat (limited to 'src/Text/Pandoc/Readers/Roff.hs')
| -rw-r--r-- | src/Text/Pandoc/Readers/Roff.hs | 78 |
1 files changed, 51 insertions, 27 deletions
diff --git a/src/Text/Pandoc/Readers/Roff.hs b/src/Text/Pandoc/Readers/Roff.hs index 4919c5bc0..d46ddd103 100644 --- a/src/Text/Pandoc/Readers/Roff.hs +++ b/src/Text/Pandoc/Readers/Roff.hs @@ -1,4 +1,7 @@ {-# LANGUAGE FlexibleContexts #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE MultiParamTypeClasses #-} +{-# LANGUAGE StandaloneDeriving #-} {-# LANGUAGE GeneralizedNewtypeDeriving #-} {- Copyright (C) 2018 Yan Pashkovsky <yanp.bugz@gmail.com> @@ -48,8 +51,9 @@ where import Prelude import Safe (lastDef) -import Control.Monad (void, mzero, mplus) +import Control.Monad (void, mzero, mplus, guard) import Control.Monad.Except (throwError) +import Control.Monad.State.Strict (StateT(..), evalStateT, get, modify, put) import Text.Pandoc.Class (getResourcePath, readFileFromDirs, PandocMonad(..), report) import Data.Char (isLower, toLower, toUpper, chr, @@ -117,8 +121,7 @@ data RoffMode = NormalMode | CopyMode deriving Show -data RoffState = RoffState { customMacros :: M.Map String RoffTokens - , prevFont :: FontSpec +data RoffState = RoffState { prevFont :: FontSpec , currentFont :: FontSpec , tableTabChar :: Char , roffMode :: RoffMode @@ -126,7 +129,17 @@ data RoffState = RoffState { customMacros :: M.Map String RoffTokens } deriving Show instance Default RoffState where - def = RoffState { customMacros = M.fromList + def = RoffState { prevFont = defaultFontSpec + , currentFont = defaultFontSpec + , tableTabChar = '\t' + , roffMode = NormalMode + , lastExpression = Nothing + } + +type MacroState = M.Map String RoffTokens + +initialMacroState :: MacroState +initialMacroState = M.fromList $ map (\(n, s) -> (n, singleTok (TextLine [RoffStr s]))) @@ -134,14 +147,19 @@ instance Default RoffState where , ("lq", "\x201C") , ("rq", "\x201D") , ("R", "\x00AE") ] - , prevFont = defaultFontSpec - , currentFont = defaultFontSpec - , tableTabChar = '\t' - , roffMode = NormalMode - , lastExpression = Nothing - } -type RoffLexer m = ParserT [Char] RoffState m +newtype RoffStream = RoffStream{ unRoffStream :: [Char] } + deriving (Show) + +deriving instance Semigroup RoffStream +deriving instance Monoid RoffStream + +instance Monad m => Stream RoffStream (StateT MacroState m) Char + where + uncons (RoffStream []) = return Nothing + uncons (RoffStream (c:cs)) = return (Just (c, RoffStream cs)) + +type RoffLexer m = ParserT RoffStream RoffState (StateT MacroState m) -- -- Lexer: String -> RoffToken @@ -212,14 +230,14 @@ readUnicodeChar _ = Nothing escapeNormal :: PandocMonad m => RoffLexer m [LinePart] escapeNormal = do c <- anyChar - case c of + (case c of ' ' -> return [RoffStr " "] '"' -> mempty <$ skipMany (satisfy (/='\n')) -- line comment '#' -> mempty <$ manyTill anyChar newline '%' -> return mempty -- optional hyphenation '&' -> return mempty -- nonprintable zero-width ')' -> return mempty -- nonprintable zero-width - '*' -> escString + '*' -> escString <|> escIgnore '*' [] ',' -> return mempty -- to fix spacing after roman '-' -> return [RoffStr "-"] '.' -> return [RoffStr "`"] @@ -283,7 +301,7 @@ escapeNormal = do CopyMode -> char '\\' NormalMode -> return '\\' return [RoffStr "\\"] - _ -> return [RoffStr [c]] + _ -> return [RoffStr [c]]) <|> escIgnore c [] -- man 7 groff: "If a backslash is followed by a character that -- does not constitute a defined escape sequence, the backslash -- is silently ignored and the character maps to itself." @@ -294,7 +312,8 @@ escIgnore :: PandocMonad m -> RoffLexer m [LinePart] escIgnore c argparsers = do pos <- getPosition - arg <- snd <$> withRaw (choice argparsers) <|> return "" + pos' <- (optional (choice argparsers) >> getPosition) + arg <- manyTill anyChar (getPosition >>= guard . (== pos')) report $ SkippedContent ('\\':c:arg) pos return mempty @@ -496,17 +515,20 @@ lexConditional mname = do then fmap not . lastExpression <$> getState else expression skipMany spacetab - st <- getState -- save state, so we can reset it + macros <- get -- save macro state, so we can reset it + st <- getState ifPart <- lexGroup <|> (char '\\' >> newline >> manToken) <|> manToken case mbtest of Nothing -> do - putState st -- reset state, so we don't record macros in skipped section + put macros -- reset state, so we don't record macros in skipped section + putState st report $ SkippedContent ('.':mname) pos return mempty Just True -> return ifPart Just False -> do + put macros putState st return mempty @@ -543,14 +565,14 @@ lexIncludeFile args = do result <- readFileFromDirs dirs fp case result of Nothing -> report $ CouldNotLoadIncludeFile fp pos - Just s -> getInput >>= setInput . (s ++) + Just s -> getInput >>= setInput . (RoffStream s <>) -- TODO sourcepos! return mempty [] -> return mempty resolveMacro :: PandocMonad m => String -> [Arg] -> SourcePos -> RoffLexer m RoffTokens resolveMacro macroName args pos = do - macros <- customMacros <$> getState + macros <- get case M.lookup macroName macros of Nothing -> return $ singleTok $ ControlLine macroName args pos Just ts -> do @@ -571,8 +593,7 @@ lexStringDef args = do -- string definition (x:ys) -> do let ts = singleTok $ TextLine (intercalate [RoffStr " " ] ys) let stringName = linePartsToString x - modifyState $ \st -> - st{ customMacros = M.insert stringName ts (customMacros st) } + modify (M.insert stringName ts) return mempty lexMacroDef :: PandocMonad m => [Arg] -> RoffLexer m RoffTokens @@ -591,9 +612,8 @@ lexMacroDef args = do -- macro definition _ <- lexArgs return () ts <- mconcat <$> manyTill manToken stop - modifyState $ \st -> - st{ customMacros = M.insert macroName ts (customMacros st) - , roffMode = NormalMode } + modify (M.insert macroName ts) + modifyState $ \st -> st{ roffMode = NormalMode } return mempty lexArgs :: PandocMonad m => RoffLexer m [Arg] @@ -635,7 +655,7 @@ lexArgs = do checkDefined :: PandocMonad m => String -> RoffLexer m [LinePart] checkDefined name = do - macros <- customMacros <$> getState + macros <- get case M.lookup name macros of Just _ -> return [RoffStr "1"] Nothing -> return [RoffStr "0"] @@ -729,8 +749,12 @@ linePartsToString = mconcat . map go -- | Tokenize a string as a sequence of roff tokens. lexRoff :: PandocMonad m => SourcePos -> T.Text -> m RoffTokens lexRoff pos txt = do - eithertokens <- readWithM (do setPosition pos - mconcat <$> many manToken) def (T.unpack txt) + eithertokens <- evalStateT + (readWithM + (do setPosition pos + mconcat <$> many manToken) def + (RoffStream (T.unpack txt))) + initialMacroState case eithertokens of Left e -> throwError e Right tokenz -> return tokenz |